Manufacturing method of press formed part

Abstract

A manufacturing method of a press formed part, the press formed part including at least a main body portion, which has a top plate portion and vertical wall portions formed via ridge portions, and an outward flange portion formed continuously with the top plate portion, the ridge portions, and the vertical wall portions at an end portion of the main body portion, the method includes: an intermediate forming step of forming an intermediate formed part having the top plate portion and the vertical wall portions formed via the ridge portions, and including a step-shaped portion bulging outward at a root portion of an outward flange corresponding portion which is to be formed into the outward flange portion; and a target shape forming step of forming the outward flange portion by bending and raising the outward flange corresponding portion of the intermediate formed part outward, and acquiring a target shape.

1 . A manufacturing method of a press formed part, the press formed part including at least
 a main body portion, which has a top plate portion and vertical wall portions formed via ridge portions, and   an outward flange portion formed continuously with the top plate portion, the ridge portions, and the vertical wall portions at an end portion of the main body portion, the method comprising:   an intermediate forming step of forming an intermediate formed part having the top plate portion and the vertical wall portions formed via the ridge portions, and including a step-shaped portion bulging outward at a root portion of an outward flange corresponding portion which is to be formed into the outward flange portion; and   a target shape forming step of forming the outward flange portion by bending and raising the outward flange corresponding portion of the intermediate formed part outward, and acquiring a target shape.   
     
     
         2 . The manufacturing method of a press formed part according to  claim 1 , wherein in the intermediate forming step, the top plate portion, the ridge portions, the vertical wall portions, and the step-shaped portion are press formed in one step. 
     
     
         3 . The manufacturing method of a press formed part according to  claim 1 , wherein in the intermediate forming step, the step-shaped portion is press formed after the top plate portion, the ridge portions, and the vertical wall portions are press formed.